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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af965aeb65aa359a5d6fa9faa4e22e3adc94ad1b35a504c631fc89b7667b0ac2' 
  AND token = 'zt2afpExkDGPpHF7XYexNO2jwNUge4jrX0xiL0CsSMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}